code: def testDateTimes(self):
      rsi = self.__buildRSI(range(10), 3)
  
      self.assertEqual(len(rsi.getDateTimes()), 10)
      for i in range(len(rsi)):
          self.assertEqual(rsi.getDateTimes()[i], None)
  
file_path: pyalgotrade/testcases/technical_rsi_test.py
imports: from .None import common
  from pyalgotrade.technical import rsi
  from pyalgotrade import dataseries
label_desc: Use image node_id 4 for calling the TestCase obj's underlying member method code with example usage: obj.testDateTimes() without return types